pongOak.go

package main

import (
	"bitbucket.org/oakmoundstudio/plasticpiston/plastic"
	"bitbucket.org/oakmoundstudio/plasticpiston/plastic/collision"
	"bitbucket.org/oakmoundstudio/plasticpiston/plastic/entities"
	"bitbucket.org/oakmoundstudio/plasticpiston/plastic/event"
	"bitbucket.org/oakmoundstudio/plasticpiston/plastic/render"
	"image/color"
	"math/rand"
)

var (
	score1 = 0
	score2 = 0
)

func main() {
	plastic.AddScene("pong",
		func(prevScene string, data interface{}) {
			NewPaddle(20, 200, 1)
			NewPaddle(590, 200, 2)
			NewBall(320, 240)
			render.Draw(render.NewIntText(&score2, 200, 20), 3)
			render.Draw(render.NewIntText(&score1, 400, 20), 3)
		}, func() bool { return true }, func() (string, interface{}) { return "pong", nil })
	plastic.Init("pong")
}

func NewBall(x, y float64) {
	b := new(entities.Moving)
	b.Init()
	b.W = 10
	b.H = 10
	b.R = render.NewColorBox(int(b.W), int(b.H), color.RGBA{0, 255, 0, 255})
	render.Draw(b.R, 2)
	b.Space = collision.NewUnassignedSpace(0, 0, b.W, b.H)
	b.CID.Bind(func(id int, nothing interface{}) int {
		if b.DX == 0 && b.DY == 0 {
			b.DY = (rand.Float64() - 0.5) * 4
			b.DX = (rand.Float64() - 0.5) * 16
			if b.DX == 0 {
				b.DX = 8
			}
		}
		b.ShiftPos(b.DX, b.DY)
		if collision.HitLabel(b.Space, 1) {
			b.DX *= -1.1
			b.DY += (rand.Float64() - 0.5) * 8
		}
		if b.X < 0 || b.X > 640 {
			if b.X < 0 {
				score1++
			} else {
				score2++
			}
			b.DX = 0
			b.DY = 0
			b.SetPos(320, 240)
		} else if b.Y < 0 || b.Y > 440-b.H {
			b.DY *= -1
		}
		return 0
	}, "EnterFrame")
	b.SetPos(x, y)
}

func NewPaddle(x, y float64, player int) {
	p := new(entities.Moving)
	p.Init()
	p.SpeedY = 4
	p.W = 20
	p.H = 100
	p.R = render.NewColorBox(int(p.W), int(p.H), color.RGBA{255, 0, 0, 255})
	render.Draw(p.R, 1)
	p.Space = collision.NewLabeledSpace(0, 0, p.W, p.H, 1)
	if player == 1 {
		p.CID.Bind(enterPaddle("UpArrow", "DownArrow"), "EnterFrame")
	} else {
		p.CID.Bind(enterPaddle("W", "S"), "EnterFrame")
	}
	p.SetPos(x, y)
}

func enterPaddle(up, down string) func(int, interface{}) int {
	return func(id int, nothing interface{}) int {
		p := event.GetEntity(id).(*entities.Moving)
		p.DY = 0
		if plastic.IsDown(up) {
			p.DY = -p.SpeedY
		} else if plastic.IsDown(down) {
			p.DY = p.SpeedY
		}
		p.ShiftY(p.DY)
		if p.Y < 0 || p.Y > (440-p.H) {
			p.ShiftY(-p.DY)
		}
		return 0
	}
}